219 lines
6.3 KiB
C
219 lines
6.3 KiB
C
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/*
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* Copyright (C) 2013, NVIDIA Corporation. All rights reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sub license,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial portions
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* of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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#ifndef __DRM_PANEL_H__
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#define __DRM_PANEL_H__
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#include <linux/err.h>
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#include <linux/errno.h>
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#include <linux/list.h>
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struct backlight_device;
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struct device_node;
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struct drm_connector;
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struct drm_device;
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struct drm_panel;
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struct display_timing;
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enum drm_panel_orientation;
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/**
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* struct drm_panel_funcs - perform operations on a given panel
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*
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* The .prepare() function is typically called before the display controller
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* starts to transmit video data. Panel drivers can use this to turn the panel
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* on and wait for it to become ready. If additional configuration is required
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* (via a control bus such as I2C, SPI or DSI for example) this is a good time
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* to do that.
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*
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* After the display controller has started transmitting video data, it's safe
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* to call the .enable() function. This will typically enable the backlight to
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* make the image on screen visible. Some panels require a certain amount of
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* time or frames before the image is displayed. This function is responsible
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* for taking this into account before enabling the backlight to avoid visual
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* glitches.
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*
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* Before stopping video transmission from the display controller it can be
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* necessary to turn off the panel to avoid visual glitches. This is done in
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* the .disable() function. Analogously to .enable() this typically involves
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* turning off the backlight and waiting for some time to make sure no image
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* is visible on the panel. It is then safe for the display controller to
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* cease transmission of video data.
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*
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* To save power when no video data is transmitted, a driver can power down
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* the panel. This is the job of the .unprepare() function.
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*
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* Backlight can be handled automatically if configured using
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* drm_panel_of_backlight() or drm_panel_dp_aux_backlight(). Then the driver
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* does not need to implement the functionality to enable/disable backlight.
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*/
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struct drm_panel_funcs {
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/**
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* @prepare:
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*
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* Turn on panel and perform set up.
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*
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* This function is optional.
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*/
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int (*prepare)(struct drm_panel *panel);
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/**
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* @enable:
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*
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* Enable panel (turn on back light, etc.).
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*
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* This function is optional.
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*/
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int (*enable)(struct drm_panel *panel);
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/**
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* @disable:
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*
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* Disable panel (turn off back light, etc.).
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*
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* This function is optional.
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*/
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int (*disable)(struct drm_panel *panel);
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/**
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* @unprepare:
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*
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* Turn off panel.
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*
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* This function is optional.
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*/
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int (*unprepare)(struct drm_panel *panel);
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/**
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* @get_modes:
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*
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* Add modes to the connector that the panel is attached to
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* and returns the number of modes added.
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*
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* This function is mandatory.
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*/
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int (*get_modes)(struct drm_panel *panel,
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struct drm_connector *connector);
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/**
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* @get_timings:
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*
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* Copy display timings into the provided array and return
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* the number of display timings available.
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*
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* This function is optional.
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*/
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int (*get_timings)(struct drm_panel *panel, unsigned int num_timings,
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struct display_timing *timings);
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};
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/**
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* struct drm_panel - DRM panel object
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*/
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struct drm_panel {
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/**
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* @dev:
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*
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* Parent device of the panel.
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*/
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struct device *dev;
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/**
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* @backlight:
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*
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* Backlight device, used to turn on backlight after the call
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* to enable(), and to turn off backlight before the call to
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* disable().
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* backlight is set by drm_panel_of_backlight() or
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* drm_panel_dp_aux_backlight() and drivers shall not assign it.
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*/
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struct backlight_device *backlight;
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/**
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* @funcs:
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*
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* Operations that can be performed on the panel.
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*/
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const struct drm_panel_funcs *funcs;
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/**
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* @connector_type:
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*
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* Type of the panel as a DRM_MODE_CONNECTOR_* value. This is used to
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* initialise the drm_connector corresponding to the panel with the
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* correct connector type.
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*/
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int connector_type;
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/**
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* @list:
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*
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* Panel entry in registry.
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*/
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struct list_head list;
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};
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void drm_panel_init(struct drm_panel *panel, struct device *dev,
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const struct drm_panel_funcs *funcs,
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int connector_type);
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void drm_panel_add(struct drm_panel *panel);
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void drm_panel_remove(struct drm_panel *panel);
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int drm_panel_prepare(struct drm_panel *panel);
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int drm_panel_unprepare(struct drm_panel *panel);
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int drm_panel_enable(struct drm_panel *panel);
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int drm_panel_disable(struct drm_panel *panel);
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int drm_panel_get_modes(struct drm_panel *panel, struct drm_connector *connector);
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#if defined(CONFIG_OF) && defined(CONFIG_DRM_PANEL)
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struct drm_panel *of_drm_find_panel(const struct device_node *np);
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int of_drm_get_panel_orientation(const struct device_node *np,
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enum drm_panel_orientation *orientation);
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#else
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static inline struct drm_panel *of_drm_find_panel(const struct device_node *np)
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{
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return ERR_PTR(-ENODEV);
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}
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static inline int of_drm_get_panel_orientation(const struct device_node *np,
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enum drm_panel_orientation *orientation)
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{
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return -ENODEV;
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}
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#endif
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#if IS_ENABLED(CONFIG_DRM_PANEL) && (IS_BUILTIN(CONFIG_BACKLIGHT_CLASS_DEVICE) || \
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(IS_MODULE(CONFIG_DRM) && IS_MODULE(CONFIG_BACKLIGHT_CLASS_DEVICE)))
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int drm_panel_of_backlight(struct drm_panel *panel);
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#else
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static inline int drm_panel_of_backlight(struct drm_panel *panel)
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{
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return 0;
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}
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#endif
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#endif
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